i do, a 5lbs and a 10lbs NOS tanks. hooking up a system is pretty easy!!! my setup in my car is: Pioneer double din headunit, 4 polk audio 6.5 3way speakers, 2 12inch round Kicker soloberic subs in a isobaric box, 1 8in bazooka tube(so that my system can hit the mid to high bass levels),1 Rockford fosgate 2000 model 600@6 amp, and a Rockford fosgate 2000 model 800@2 amp. the reason why im using the 8in bazooka is because the 2 12's and the isobaric box produces the "boomy bass." so it couldnt really hit the mid to high bass levels.
i wouldnt mind giving you guys that do not know how to installing car audio systems the basics. but if i were to really type it all out, i think you guys would still not understand. just remember, get the right fuse for the power wire. you wanna keep the power fuse/holder no more than 12in away from the cars battery. the reason for the fuse is if there's a short somewhere in the setup then i really dont think you wanna find out what happens if there is a short in setup, with out a power wire fuse. well if you guys have any questions on how to set it up, set the gain/eq/cross over levels, what level wires should be used, type of box for the type of speakers in your setup, etc. then email me and i will try my best to help. its really not that hard at all. the way i learned was i had bought a new headunit for my car and asked my older brother if he can install it. he then went in the house without saying a word, came back with a manual on the wire diagrams. so then i installed the headunit with the manual he gave me. when i was done connecting all the wires and mounting the headunit, to my surprise it turned on with no errors!!!! so if u know how to do that then you will get the whole concept of the car audio system. but i suggest reading up on the type of wires you shoud use(power,speaker,ground,and remote.) also what size fuse you should use. By the way, nice prices!!!! one more thing, those NOS tanks were not used to help the performance of my car!!!